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Editor to share with you what the PHP constant is, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to understand it!

Description: once a constant is defined, the values and constants cannot be changed and destroyed, and the constant name cannot be repeated. Constant names are recommended to be capitalized

Php constant definition:

Syntax: define (constant name, constant value); compound data cannot be defined in this way

Define ('NAME','QINGYU'); define (' PI',3.14)

5.6PHP version:

Const to define matching data, such as arrays.

Const PI = 3.14

7.0php version:

Define can define composite data if the array.

Define ('ARR', [1 and 2); php accesses constants

Just use the constant name directly.

Echo PI;var_dump (NAME); php constant usage scenario

It is used many times in the configuration file of the website. Such as the path of the current website, etc.

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